All Concert Pianists (with the exception of Claudio Arrau) show up before Rehearsal and try out the piano, and then make recommended changes.After that (before the Performance), they see to it that all of the necessary adjustments have been made.Oh Gosh, that means: no Pianist would (having had a conversation with the Tuner/Technician who worked on the instrument), would ever Play/Perform on a "Stiff Action."Please hold yourself to the same standard. I have!
Unfortunately as much as I would like that luxury, I generally haven't had that option ... maybe in the future that will change.
Thank you for your thoughtful inquiry. It (unlike what you naturally assume), is not a problem specific to you but, instead, is universal in nature - in my opinion.So, if you do not have the intestinal fortitude/GUTS! to demand/insist that the instrument that you play/perform on is properly "Regulated," then I want you to think about this reality.When you play "For The Rest Of Your Life," those who would critique you will NEVER consider that the Piano is to blame. Ever!For the record, (I was in attendance) people are still talking about the 1974 Performance of Claudio Arrau in Austin, Texas. Why? Because when he played the Schumann Symphonic Etudes, you could not hear the scale passages at the top.The idiot technician had lightened up the action to that point. And, the idiot performer did not test it out ahead of time.All the best.